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(No Model.) 2 Shee ts-Sheet 1;

J. HENWOOD.

DIRECT ACTION STEAM PUMP.

Patented Aug. '28, 1.883.

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2 Shets-Sheet 2.

(No Model.)

J HENW'OOD. DIREGTAUTION STEAM PUMP.

No. 284,010. Patented Aug. 28, 1883.

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JOHN nnn'woon, or PHILADELPHIA, PA., ASSIG-NOR T0 HIMSELF, JOSEPH c. WHITAKER AND CHARLES R. soULL, ALL or SAME rLAcn.

DI RECT' ACTION STEAM-=PUM P SPECIFICATION forming part of Letters Patent No. 284,010, dated August 28, 1883.

(N0 model.)

To all whom it may concern.-

Be it known that 1, JOHN HENWOOD, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented certain Improvements inDirect-Action Steam-Pumps, of which the following is a specification.

My invention relates to improvements in thatclass of direct-action duplex steam-pumps in which the stroke is limited by a crank or cranks; and the object of my improvements, which are fully described hereinafter, is to make a compact, simple, and cheap duplex pump of this class.

In the accompanying drawings, Figure 1, Sheet 1, is a side view of the duplex steampump, part of the frame being broken away; Fig. 2, a plan View; Fig. 3, Sheet 2, a transverse section on the line 1 2, looking in the di rection of the arrow 1; Fig. 4, a transverse section on the line 3 4, looking in the direction of the arrow 2; Fig. 5, a sectional plan, drawn to an enlarged scale, of part of the operating mechanism; Fig. 6, a perspective view of the cross-head, and Fig. 7 a diagram illustrating the arrangement of the cranlcpins.

The two steam-cylinders A A, placed side by side; are preferably made in one casting, each having the usual piston, steam-chest, and

slide-valve, which are similar to those of ordinary steam-engines, and therefore need not be minutely described.

The two pump-barrels B and 13, also placed side by side and preferably cast in one piece, are provided with the usual plungers or pistons, valvechests, and suction and exhaust valves, which may be similar to those of ordinary duplex pumps.

The frame-work D, by which the two pumps are connected to the two steam-cylind ers, c011- sists of the plate a, forming the head for the two pump-barrels, the plate 11, forming the head for the two steam-cylinders, the opposite side bars, (Z and d, and the intermediate bar, 6, the whole being cast in one piece.

G and G are the two piston-rods, connected at one end to the plungers or pistons of the pump-barrels, and at the opposite end to the pistons of the steam-cylinders.

I dispense with a fly-wheel, as unnecessary in duplex pumpsof this class, and use ashort crank-shaft, E, adapted toa short centralbean ing, f, 011 the central bar of the frame-an arrangement which enables me to contract the pump-structure laterally, the shaft having two crank-wheels, F F, one at each end of and preferably cast in one piece with the shaft, as best observed in Fig. 3; and in order to further save space laterally the two crank-wheels are in the present instance eccentrics for operating the slide valves of the two cylinders.

On each eccentric crank-wheel is cast a crankpin, it, adapted to one stub end of a connecting-rod, H, this plan of casting the pin on the wheel obviating the necessity of making the eccentric of undue diameter. The opposite stub end of the connecting-rod is adapted to a pin, 6, on a cross-head, K, which is constructed in the peculiar manner illustrated in Fig. 6. This cross-head consists of the clamp j, the rib k, and the aforesaid pin a, all being cast in one piece, the clamping portion beingadapted to the piston-rod, and being secured thereto by a bolt passing through lugs a a, which causes the clamp to tightly embrace the piston-rod, thereby securing the cross-head thereto. To prevent all possibility of the sliding of the cross-head on the piston-rod, I out a screw-thread on a portion of latter, as shown in Fig. 5, the clamp being internally threaded accordingly.

On the inner side of each of the opposite side bars, (I and d, of the connecting-frame is formed a guide, q, and into the groove of each guide fits the lower end of the rib 7c of one of the cross-heads. It should be understood that this 8 5 guide is for the sole purpose of preventing the cross-head and piston-rod from turning.

The periphery of each eccentric crank-wheel is grooved for the reception of a strap, 15, to which is secured a rod, M, the outer end of the latter being connected at w to a lever, N, hung to a stud which is secured to the under side of the central bar, 0, of the connectingframe. There is alever, N, for each eccentric, and the upper end of one lever is. connected 5 to the valve-spindle of one steam-cylinder, the upper end of the otherlever being connected to the valve-spindle of the other steam-cylinder. The cranks are at right angles or thereabout, as in other coupled engines- Thus, as shown in the diagram Fig. 7, when the pin it of the crank-wheel F is in the position there of the simplest construction, and that the midshown, the pin of the other crank-wheel will be in the position indicated by the dotted circle.

The main object of my invention has been to bring two steam-cylinders as close together as possible, and the same with the pump-barrels, so as to insure compactness and lightness, and at the same time to control the limit of the movement of the pistons by a crankshaft and cranks, which do not require the aid of a cumbrous fiy-wheel. Further compactness laterally is obtained by the manner of constructing the clamping cross-head, by which the pini, forming part of the clamp, is brought very near'to the piston-rod.

It will be seen that the connecting-frame is dle bar of the frame serves to carry the crankshaft and its eccentric crank-wheels, as well as the stud for the valve-levers. The crank-shaft is necessarily short, but long enough for the duty which it has to perform.

Eccentrics separate from the crank-wheels might be used; but this would involve the necessity of arranging the steam-cylinders and pump-barrels farther apart from each other, and this would result in increased bulk, which I am anxious to avoid.

I claim as my invention 1. The combination, in a duplex steampump, of thefollowing elements, namely: first, two steam-cylinders placed side by side, and

two pump-barrels, also placed side by side; second, two piston-rods connecting the pistons of the cylinders to those of the pump-barrels; third, a crank shaft situated between the pump-barrels and cylinders and, fourth, a single bearing, f, for the crank-shaft, all substantially .as set forth.

2. The combination of the two pump-barrels and two steam-cylinders with a connecting-frame composed of the two side bars, d d, and the central bar, e, having the single bearing f for the crankshaft, as set forth.

8. The combination of the two steam-cylinders, the two pump-barrels, the crank-shaft, 45 and two eccentric wheels, forming parts thereof, for actuating the valves, with the two crankpins attached directly to or forming a part of the said wheels, substantially as described.

4:. The combination of the crank-shaft and the two. piston rods, each provided with a clamping cross-head having a projection, is, adapted to a guide, and a pin, a, and the projection and pin forming parts of the said clamping cross-head, substantially as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOHN HENWOOD.

Witnesses:

HARRY L. ASHENFELTER, HENRY HowsoN, Jr. 

